doubt regarding mp3 playing

hi, i'm working with j2me and in that i'm want to play a mp3 file from the phone memory itself.My pbm is i don't know how to get the path to the phone memory.and also i want to play it from a site using the url for that i wrote one code.It' working but the pbm with that is some unwanted noises are added with that mp3 files.please anyone show ne the way to overcome this error.and also to start with phone memory. thanx in advance sankar